Stalk, Monitor, Inject, Record, and Control or SMIRC - pronounced as 'smirk', is the acronym
Most O/S, web sites, ISPs, Anti-Virus, programs, device apps and some hardware incorporate the SMIRC process in one form or another. It's open season on privacy.
Merriam-Webster Dictionary defines "stalking" as:
* Legal Definition of stalking: the act or crime of willfully and repeatedly following or harassing another person in circumstances that would cause a reasonable person to fear injury or death especially because of express or implied threatsbroadly : a crime of engaging in a course of conduct directed at a person that serves no legitimate purpose and seriously alarms, annoys, or intimidates that person.
NOTE: Stalking is often considered to be aggravated when the conduct involved also violates a restraining order protecting the victim.
* The U.S. version. See the Wikipedia definitions of stalking for other countries.